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Changes to CMake toolchain files

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We still haven't successfully xcompiled, but we're working
toward it.
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Latent Prion
2025-10-17 12:43:06 -04:00
parent d317f1fb06
commit e4e700c362
2 changed files with 75 additions and 1 deletions
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cmake/aarch64-linux-gnu.cmake
+1 -1
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@@ -31,7 +31,7 @@ set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# Search for libraries and headers in the target directories
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
# Set pkg-config to use the cross-compiled libraries
set(ENV{PKG_CONFIG_PATH} "/usr/aarch64-linux-gnu/lib/pkgconfig:/usr/lib/aarch64-linux-gnu/pkgconfig")
cmake/x86_64-linux-gnu.cmake
+74
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@@ -0,0 +1,74 @@
# ----------------------------------------------------------------------------------
# MANDATORY USER VARIABLE
# ----------------------------------------------------------------------------------
# IMPORTANT: This variable MUST be set when running CMake to specify where the
# laptop's sysroot (the root directory of the mounted laptop filesystem) is located.
#
# Usage example: cmake -DCMAKE_TOOLCHAIN_FILE=laptop_x86_sysroot.cmake
# -DTARGET_SYSROOT=/mnt/laptop_sysroot/ <path_to_source>
#
# If the variable is not defined, we fall back to a common system root path for safety.
if(NOT DEFINED TARGET_SYSROOT)
set(TARGET_SYSROOT "/usr/lib/x86_64-linux-gnu")
message(STATUS "TARGET_SYSROOT not explicitly defined. Defaulting to ${TARGET_SYSROOT}")
endif()
# ----------------------------------------------------------------------------------
# SYSROOT and COMPILER CONFIGURATION
# ----------------------------------------------------------------------------------
set(CMAKE_CROSSCOMPILING TRUE)
# 1. Architecture and Platform Identification
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR x86_64)
set(TARGET_TRIPLE x86_64-linux-gnu) # Standard Debian/Ubuntu triple
# 2. Set the CMAKE_SYSROOT using the user-defined variable
set(CMAKE_SYSROOT ${TARGET_SYSROOT})
message(STATUS "Using CMAKE_SYSROOT: ${CMAKE_SYSROOT}")
# 3. Specify the Cross Compilers
# These binaries must be installed on your RPi:
# sudo apt install g++-x86-64-linux-gnu gcc-x86-64-linux-gnu
set(CMAKE_C_COMPILER ${TARGET_TRIPLE}-gcc)
set(CMAKE_CXX_COMPILER ${TARGET_TRIPLE}-g++)
# ----------------------------------------------------------------------------------
# PKG-CONFIG CONFIGURATION (CRUCIAL FOR CROSS-COMPILING)
# ----------------------------------------------------------------------------------
# 1. Define the search path for .pc files, relative to the sysroot.
# This ensures we look in the target's standard pkgconfig locations.
set(PKG_CONFIG_SEARCH_PATHS
"${CMAKE_SYSROOT}/usr/lib/${TARGET_TRIPLE}/pkgconfig" # Primary location on Debian/Ubuntu
"${CMAKE_SYSROOT}/usr/share/pkgconfig" # Secondary shared location
"${CMAKE_SYSROOT}/usr/lib/pkgconfig" # Another common location
)
# Join the paths using the system's path separator (colon on Linux)
string(REPLACE ";" ":" PKG_CONFIG_LIBDIR_STRING "${PKG_CONFIG_SEARCH_PATHS}")
# Set the environment variable PKG_CONFIG_LIBDIR
# This tells pkg-config exactly where to find the x86_64 .pc files.
# 2. Set the sysroot directory for pkg-config
# This tells pkg-config to prepend CMAKE_SYSROOT to any paths it finds in the .pc files.
set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})
set(ENV{PKG_CONFIG_LIBDIR} ${PKG_CONFIG_LIBDIR_STRING})
set(ENV{PKG_CONFIG_PATH} "")
message(STATUS "PKG_CONFIG_SYSROOT_DIR set to: ${CMAKE_SYSROOT}")
message(STATUS "PKG_CONFIG_LIBDIR set to: ${PKG_CONFIG_LIBDIR_STRING}")
# ----------------------------------------------------------------------------------
# CMAkE FIND BEHAVIOR
# ----------------------------------------------------------------------------------
# The CMAKE_FIND_ROOT_PATH tells CMake where to look for programs, libraries, etc.
set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
# Restrict search to the sysroot, not in the RPi's native locations,
# but allow programs (like pkg-config itself) to be found on the RPi.
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)